Dcesther – If your Northbridge heatsink has an attaching mechanism, you can use a thermal compound like Arctic Silver 3. If there is no attaching mechanism, then you need a thermal adhesive. Should this be the case and you use Arctic Silver Thermal Adhesive, we do not recommend mixing it with Arctic Silver 3. Mixing the adhesive with Arctic Silver 3 may weaken the bond. Due to variables in surfaces, preparation (cleaning the surfaces to be bonded), clamping pressure during the cure, cure time, etc., we cannot guarantee the bond strength or performance of our thermal adhesives when mixed with our thermal compounds.
Colin Thompson
Arctic Silver, Inc.